334 lines
9.4 KiB
TypeScript
334 lines
9.4 KiB
TypeScript
/*
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This file is part of TALER
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(C) 2015 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* Script that is injected into (all!) pages to allow them
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* to interact with the GNU Taler wallet via DOM Events.
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*
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* @author Florian Dold
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*/
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/// <reference path="../lib/decl/chrome/chrome.d.ts" />
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/// <reference path="../lib/decl/urijs/URIjs.d.ts" />
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"use strict";
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declare var cloneInto: any;
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// Make sure we don't pollute the namespace too much.
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namespace TalerNotify {
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const PROTOCOL_VERSION = 1;
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if (!taler) {
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console.error("Taler wallet lib not included, HTTP 402 payments not" +
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" supported");
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}
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function subst(url: string, H_contract: string) {
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url = url.replace("${H_contract}", H_contract);
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url = url.replace("${$}", "$");
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return url;
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}
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interface Handler {
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type: string;
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listener: (e: CustomEvent) => void|Promise<void>;
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}
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const handlers: Handler[] = [];
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function hashContract(contract: string): Promise<string> {
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let walletHashContractMsg = {
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type: "hash-contract",
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detail: {contract}
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};
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return new Promise((resolve, reject) => {
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chrome.runtime.sendMessage(walletHashContractMsg, (resp: any) => {
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if (!resp.hash) {
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console.log("error", resp);
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reject(Error("hashing failed"));
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}
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resolve(resp.hash);
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});
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});
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}
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function checkRepurchase(contract: string): Promise<any> {
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const walletMsg = {
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type: "check-repurchase",
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detail: {
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contract: contract
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},
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};
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return new Promise((resolve, reject) => {
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chrome.runtime.sendMessage(walletMsg, (resp: any) => {
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resolve(resp);
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});
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});
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}
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function putHistory(historyEntry: any): Promise<void> {
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const walletMsg = {
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type: "put-history-entry",
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detail: {
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historyEntry,
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},
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};
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return new Promise((resolve, reject) => {
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chrome.runtime.sendMessage(walletMsg, (resp: any) => {
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resolve();
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});
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});
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}
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function init() {
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chrome.runtime.sendMessage({type: "ping"}, (resp) => {
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if (chrome.runtime.lastError) {
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console.log("extension not yet ready");
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window.setTimeout(init, 200);
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return;
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}
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registerHandlers();
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// Hack to know when the extension is unloaded
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let port = chrome.runtime.connect();
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port.onDisconnect.addListener(() => {
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console.log("chrome runtime disconnected, removing handlers");
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for (let handler of handlers) {
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document.removeEventListener(handler.type, handler.listener);
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}
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});
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if (resp && resp.type === "fetch") {
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console.log("it's fetch");
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taler.internalOfferContractFrom(resp.contractUrl);
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document.documentElement.style.visibility = "hidden";
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} else if (resp && resp.type === "execute") {
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console.log("it's execute");
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document.documentElement.style.visibility = "hidden";
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taler.internalExecutePayment(resp.contractHash,
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resp.payUrl,
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resp.offerUrl);
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}
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});
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}
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console.log("loading Taler content script");
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init();
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interface HandlerFn {
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(detail: any, sendResponse: (msg: any) => void): void;
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}
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function registerHandlers() {
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/**
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* Add a handler for a DOM event, which automatically
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* handles adding sequence numbers to responses.
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*/
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function addHandler(type: string, handler: HandlerFn) {
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let handlerWrap = (e: CustomEvent) => {
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if (e.type != type) {
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throw Error(`invariant violated`);
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}
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let callId: number|undefined = undefined;
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if (e.detail && e.detail.callId != undefined) {
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callId = e.detail.callId;
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}
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let responder = (msg?: any) => {
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let fullMsg = Object.assign({}, msg, {callId});
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let opts = { detail: fullMsg };
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if ("function" == typeof cloneInto) {
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opts = cloneInto(opts, document.defaultView);
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}
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let evt = new CustomEvent(type + "-result", opts);
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document.dispatchEvent(evt);
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};
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handler(e.detail, responder);
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};
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document.addEventListener(type, handlerWrap);
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handlers.push({type, listener: handlerWrap});
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}
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addHandler("taler-query-id", (msg: any, sendResponse: any) => {
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// FIXME: maybe include this info in taoer-probe?
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sendResponse({id: chrome.runtime.id})
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});
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addHandler("taler-probe", (msg: any, sendResponse: any) => {
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sendResponse();
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});
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addHandler("taler-create-reserve", (msg: any) => {
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let params = {
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amount: JSON.stringify(msg.amount),
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callback_url: URI(msg.callback_url)
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.absoluteTo(document.location.href),
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bank_url: document.location.href,
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wt_types: JSON.stringify(msg.wt_types),
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};
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let uri = URI(chrome.extension.getURL("pages/confirm-create-reserve.html"));
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let redirectUrl = uri.query(params).href();
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window.location.href = redirectUrl;
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});
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addHandler("taler-confirm-reserve", (msg: any, sendResponse: any) => {
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let walletMsg = {
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type: "confirm-reserve",
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detail: {
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reservePub: msg.reserve_pub
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}
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};
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chrome.runtime.sendMessage(walletMsg, (resp) => {
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sendResponse();
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});
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});
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addHandler("taler-confirm-contract", async(msg: any) => {
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if (!msg.contract_wrapper) {
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console.error("contract wrapper missing");
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return;
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}
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const offer = msg.contract_wrapper;
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if (!offer.contract) {
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console.error("contract field missing");
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return;
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}
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if (!offer.H_contract) {
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console.error("H_contract field missing");
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return;
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}
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let walletHashContractMsg = {
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type: "hash-contract",
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detail: {contract: offer.contract}
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};
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let contractHash = await hashContract(offer.contract);
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if (contractHash != offer.H_contract) {
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console.error("merchant-supplied contract hash is wrong");
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return;
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}
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let resp = await checkRepurchase(offer.contract);
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if (resp.error) {
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console.error("wallet backend error", resp);
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return;
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}
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if (resp.isRepurchase) {
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console.log("doing repurchase");
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console.assert(resp.existingFulfillmentUrl);
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console.assert(resp.existingContractHash);
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window.location.href = subst(resp.existingFulfillmentUrl,
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resp.existingContractHash);
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} else {
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let merchantName = "(unknown)";
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try {
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merchantName = offer.contract.merchant.name;
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} catch (e) {
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// bad contract / name not included
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}
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let historyEntry = {
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timestamp: (new Date).getTime(),
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subjectId: `contract-${contractHash}`,
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type: "offer-contract",
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detail: {
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contractHash,
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merchantName,
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}
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};
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await putHistory(historyEntry);
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const uri = URI(chrome.extension.getURL(
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"pages/confirm-contract.html"));
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const params = {
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offer: JSON.stringify(offer),
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merchantPageUrl: document.location.href,
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};
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const target = uri.query(params).href();
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if (msg.replace_navigation === true) {
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document.location.replace(target);
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} else {
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document.location.href = target;
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}
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}
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});
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addHandler("taler-payment-failed", (msg: any, sendResponse: any) => {
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const walletMsg = {
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type: "payment-failed",
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detail: {},
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};
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chrome.runtime.sendMessage(walletMsg, (resp) => {
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sendResponse();
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})
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});
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addHandler("taler-payment-succeeded", (msg: any, sendResponse: any) => {
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console.log("got taler-payment-succeeded");
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sendResponse();
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});
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addHandler("taler-get-payment", (msg: any, sendResponse: any) => {
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const walletMsg = {
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type: "execute-payment",
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detail: {
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H_contract: msg.H_contract,
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},
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};
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chrome.runtime.sendMessage(walletMsg, (resp) => {
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if (resp.rateLimitExceeded) {
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console.error("rate limit exceeded, check for redirect loops");
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}
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if (!resp.success) {
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if (msg.offering_url) {
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window.location.href = msg.offering_url;
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} else {
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console.error("execute-payment failed", resp);
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}
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return;
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}
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let contract = resp.contract;
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if (!contract) {
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throw Error("contract missing");
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}
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// We have the details for then payment, the merchant page
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// is responsible to give it to the merchant.
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sendResponse({
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H_contract: msg.H_contract,
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contract: resp.contract,
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payment: resp.payReq,
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});
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});
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});
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}
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}
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